Mossberg’s legendary 590 tactical pump-action has been upgraded with the Magpul® M-LOK modular mounting system integrated into the forends. This update applies to the 590/590A1 models that previously featured Tri-Rail forends. The new forend incorporates M-LOK compatible mounting holes on both sides and the bottom which allows for attachment of Magpul rails, simplifying customization of your 590/590A1 shotgun. Attach a variety of tactical accessories and lights in minutes to meet your needs (rails and accessories not included). Based on the venerable 500 pump-action platform, 590 and 590A1 shotguns feature non-binding twin action bars; positive steel-to-steel lock-up and anti-jam elevator; dual extractors; drilled and tapped receivers; cylinder bores; and universally-recognized, ambidextrous top-mounted safety. The 590 also has a convenient clean-out magazine tube with cap for ease of maintenance. 590A1 models are built to rugged MIL-SPEC requirements and feature heavy-walled barrels; metal trigger guard; and metal safety button.